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https://issues.apache.org/jira/browse/TINKERPOP-1867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16320432#comment-16320432
]
ASF GitHub Bot commented on TINKERPOP-1867:
-------------------------------------------
Github user dkuppitz commented on the issue:
https://github.com/apache/tinkerpop/pull/775
I've merged this branch into `master/` (locally), but it didn't change
anything (which is actually a good thing, as I don't like surprises after a
merge :)). We still get the kinda unexpected empty list in OLTP and the whole
bunch of empty lists in OLAP:
```
gremlin> g =
TinkerFactory.createModern().traversal().withoutStrategies(StandardVerificationStrategy)
==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
gremlin>
g.V(1).repeat(aggregate("a").fold().store("x").unfold().both().where(without("a")).dedup()).cap("x").next()
==>[]
==>[v[1]]
==>[v[3],v[2],v[4]]
==>[v[6],v[5]]
gremlin> g =
TinkerFactory.createModern().traversal().withComputer().withoutStrategies(StandardVerificationStrategy)
==>graphtraversalsource[tinkergraph[vertices:6 edges:6], graphcomputer]
gremlin>
g.V(1).repeat(aggregate("a").fold().store("x").unfold().both().where(without("a")).dedup()).cap("x").next()
==>[v[1]]
==>[]
==>[]
==>[]
==>[]
==>[]
==>[v[2],v[4],v[3]]
==>[v[5],v[6]]
```
The results are the same in `tp32/` and `master/`, nothing's changed.
So, although the issue looks similar, it's probably a whole different thing
that just happens to produce the same kind of unexpected result entries.
> union() can produce extra traversers
> -------------------------------------
>
> Key: TINKERPOP-1867
> URL: https://issues.apache.org/jira/browse/TINKERPOP-1867
> Project: TinkerPop
> Issue Type: Bug
> Components: process
> Affects Versions: 3.2.7
> Reporter: stephen mallette
> Assignee: Daniel Kuppitz
>
> Hard to say where this bug is coming from but basically the most simple
> representation is:
> {code}
> gremlin> g.V(1,2).local(__.union(__.constant(1).count()))
> ==>1
> ==>0
> ==>1
> {code}
> Similar problems occur with {{sum()}} and other reducing barriers when used
> in this context.
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